Radius tool



March 1, 1955 GROVE 2,703,032

RADIUS TOOL Filed July 18, 1952 INVENTOR Caz/4% United States PatentRADIUS TOOL Theron A. Grove, Durham, N. C. 7 Application July 18, 1952,Serial No. 299,580

6 Claims. (CI. 82-11) The present invention relates to a radius tool andit consists in the combinations, constructions and arrangements of partsherein described and claimed.

Generally there is provided a radius tool the use of which will assistworkmen in the making of radii and balls on lathes, shapers, planers andthe like. The tool of the present invention attaches to the conventionaltool post associated with such machines and may be changed from oneradius to another instantly and without removing the tool from the postand without the necessity for resharpening the same. When used with apointed tool bit it will cut any radius or sphere desired. If a radiustool bit is used with the present invention, then the radius of such bitmay be added or detracted from the conventional measurements to make aperfect are.

It is accordingly an object of the invention to provide a. novel radiustool which is capable of being adjusted in situ upon a machine to whichit is attached. Another object of the invention is to provide, in adevice of the character set forth, novel means for adjusting theposition -of a cutter blade forming a part of the in vention.

Another object of the invention is to provide a device of the characterset forth which is simple in construction, inexpensive to manufactureand yet effective and eificient in use.

Other and further objects of the invention will become apparent from areading of the following specification taken in conjunction with thedrawing, in which:

Figure 1 is a plan view of an embodiment of the invention,

Figure 2 is a sectional view taken along line 22 of Figure 1,

Figure 3 is a fragmentary sectional view taken substantially along line33 of Figure 2, and

Figure 4 is a fragmentary sectional view taken substantially along line4--4 of Figure 2.

Referring more particularly to the drawing, there is shown therein aradius tool comprising an elongated base member which extendshorizontally and which is provided with a circular opening 11 adjacentone end thereof which opening 11 is adapted to receive therethrough atool post indicated in dotted lines at 12 in Figure 2. Such tool postsare conventional and are conventionally provided with a verticallyextending lock slot (not shown) through which a locking block 13 isadapted to be inserted after which a set screw is first pressed againstthe upper end of such block to lock the base 10 in position. A chain 14interconnects the block 13 with the base 10 to prevent loss of the block13.

The base 10 is provided upon its upper side with a pair of transverselyextending spaced parallel rails which are formed integrally with thebase 10, as indicated at 15. A transversely removable plate 16 isprovided upon its underside with a pair of spaced transversely extendingparallel grooves 17 each of which is adapted to receive therein one ofthe rails 15. The plate 16 is also centrally provided with atransversely extending slot 18.

A vertically extending cylindrical post 19 is centrally afiixed to theupper side of the base 10 adjacent the outer end thereof and is adaptedto extend through the slot 18.

A longitudinally slidable plate or carriage 20 is centrally providedwith an upstanding collar 21 which is formed integrally therewith and acircular opening 22 extends vertically through the collar 21 and plate20.

The outer end of the plate 20 tapers, as indicated at 23 and hasintegrally formed at its outer end an upstanding v 2,703,032 PatentedMar. 1, 1955 tool socket 24 in which is removably mounted a cutting tool25 which is held in the socket 24 by means of a set screw 26. the upperside of the plate 16 is formed thereon adjacent each side edge thereofan upstanding longitudinally disposed rail 27 each or which isreceivable in a groove 28 rormed on the underside of the plate 20.

A vertically extending cylinder 2: 1s revolubly mounted in the opening22 and 15 provided with an outwardly ex- Ltillumg annular nange do whichovernes the upper end or the collar 21. me outer race or the nange 30 isbeaded, as mdlcated at 31.

The cylinder 29 is provided with an eccentrically positioned verticallyextending cylindrical opemng 32 in which is revoluble a cam 33 which isprovided at its upper end with an outstanding flange 34 whose outer raceis headed, as indicated at J5. lhe cam so is provideo with aneccentrrcally positioned vertically extending cylindrical opening 30 torthe reception thereuhrough or the post 19. inc post 19 is exteriorlythreaded, as indicated at 31, at its upper end tor the threadedreceptlon thereon or a nut 36.

the upper race of the enlarged portion 34 is provided with a radiallyextending marker 39 ad acent the peripheral edge tnereor and a series ofindicia 40 is placed upon, by cutting or otherwise, the upper race orthe enlarged portion 30. A series or inwardly extending radial openings41 rormed in the peripheral edge or the enlarged portion 30 of thecylinder 29. A set screw 42 extends inwardly through the Ilange 30 andis adapted to bear against a reduced angular portion 43 formed in theupper portion of the cam 33.

in operation, it will be apparent that the base 10 may be fixed inconventional manner to the tool post 12 and thereafter locked by meansor the block 13. inc base 10 will be extend toward the work piece-uponwhich the blade 25 is to act and it will betseen that by setting themarker 39 with the proper indicia 40 which indicia indicate a particularradius in each case, and thereafter locking the cam 33 in positionwithin the cylinder 29 by means of the set screw 42, that by inserting alever in any convenient opening 41 that the blade 25 will be caused tomove in a circular path when viewed from above. It will also be seenthat in one half of the revolution of the blade 25 that the blade willcut into the work piece to cut a radius therein and that in the otheronehalf of its revolution it will act to cut a substantial hemisphere orball. Thus by constantly readjusting the position of the cam 33 asaforesaid and moving the work longitudinally with respect to the cutterblade 25, a great variety of shapes may be formed in the work pieces towhich the blade 25 is applied, it being understood that the work piecesare revolved as they come into contact with the cutter blade, suchrevolving of the work being conventional in lathes and like machines.

While but one form of the invention has been shown and described herein,it will be readily apparent to those skilled in the art that many minormodifications may be made without departing from the spirit of theinvention. or the scope of the appended claims.

What is claimed is:

l. A device of the character described comprising a base adapted to beattached to the tool post of a lathe or the like, a lower platetransversely slidable upon said base, and having a transverse slottherein, an upper plate slidable upon said lower plate longitudinallywith respect to said base and having a circular opening therein, acylinder revolubly mounted in said circular opening and having aneccentrically disposed cylindrical opening therethrough, a cam revolublymounted in said cylindrical opening and having an eccentric openingtherethrough, a shaft afiixed to said base and extending through saidslot and said eccentric opening, a socket afiixed to one side of saidupper plate, a cutting tool removably mounted in said socket, means forlocking said cam in selected positions in said cylinder, and means forturning said cylinder.

2. A device as defined in claim 1 wherein said locking means comprises aset screw extending through the flange of said cylinder and adapted tobear against the side of said cam.

3. A device as defined in claim 1 wherein said turning means comprises aplurality of radial openings in said cylinder for the reception thereinof a lever.

4. A base for use on a machine tool, a post mounted on and extendedupwardly from said base, a plate having a transversely disposed slottherein mounted to slide transversely on said base, a carriage having avertically disposed cylindrical opening therethrough mounted to slidelongitudinally on said plate, a cylinder having a vertically disposedeccentrically' positioned opening therein journaled in the cylindricalopening'of the carriage, a centrally located upstanding collar on saidcarriage, an outwardly extending annular flange on said cylinderoverlying the upper edge of said collar, said post extended upwardlythrough the transversely disposed slot of the plate and cylindricalopenings of'the carriage and cylinder, and a cylindrical cam journaledon said post and positioned to rotate in the vertically disposedcylindrical opening of the cylinder-whereby upon rotation of the earnthe carriage travels longitudinally of the plate and the plate travelstransversely of the base, said carriage having a tool holding socket onan extended end.

5. In a radius tool, the combination which comprises a base for use onamachine tool, a postmounted on and extended upwardly from said base, aplate having a'transversely disposed slot therein mounted to slidetransversely on said base and positioned-with the slot straddling thepost, a carriage having a vertically disposed cylindrical openingtherethrough mounted to slide longitudinally on said plate, a cylinderhaving a vertically disposed eccentrically positioned opening thereinjournaled in the cylindrical opening of the carriage, a centrallylocated upstanding collar on said carriage, an outwardly extendingannular flange on said cylinder overlying the upper edge of said collar,and a vertically disposed cylindrical cam journaled on said post andpositioned to rotate in the vertically disposed cylindrical opening ofthe cylinder, said carriage having a tool holding socket on an extendedend, said cylinder having spaced radially disposed graduations on theupper end and said cam having a point positioned to register with thegraduations of the cylinder.

6. In a radius tool, the combination which comprises a base having'anopening therethrough for mounting the base on a tool post of a machinetool, said base having spaced transversely disposed rails on the uppersurface, a plate having an elongated slot in the intermediate portionand spaced grooves positioned to receive the rails of the base slidablymounted on the base, said plate having longitudinally disposed rails onthe upper surface, a carriage having a vertically disposed cylindricalopening therethrough and spaced longitudinally disposed grooves in theunder surface mounted on the plate and positioned whereby the rails ofthe plate extend into grooves in the under surface thereof, a cylinderhaving a vertically disposed eccentrically positioned opening thereinjournaled in the cylindrical opening of the carriage and having anannular flange on the upper end extended over a portion of the carriage,a post mounted on the base and extended upwardly through the slot of theplate and through the cylindrical opening of the cylinder, a cylindricalcam journaled on said post and positioned to rotate in the verticallydisposed opening of the cylinder, an outwardly extending annular flangeon said cam overlyin'gthe upper edge of said cylinder, a radiallyextending marker on the flange on the cam adjacent the peripheral edgethereof, indicia on the upper face of the cylinder for cooperation withsaid marker, said carriage having a tool holding socket on an extendedend, and means for locking the parts of the device in adjustedpositions.

References Cited in the file of this patent UNITED STATES PATENTS822,754 McLeod June 5, 1906 1,931,143 Feit Oct, 17, 1933 2,104,238Nichols Jan, 4, 1938 2,189,242 Edwin et al. Feb. 6, 1940 2,308,974Harper Jan. 19, 1943 2,470,097 Goulette May 17, .1949

OTHER REFERENCES American Machinist, Sept. 6, 1917, page 431.

